Molar Mass Calculator is a powerful, free online tool that instantly calculates the molar mass of any chemical compound. You simply enter the chemical formula (like H2O, CO2, or C6H12O6), and our calculator delivers precise results in seconds.
This tool eliminates tedious manual calculations and prevents common errors. Students, teachers, and professionals use it daily for chemistry homework, laboratory work, research projects, and industrial applications.
Molar Mass Calculator
How to Use Our Calculator?
Step 1: Identify Your Chemical Formula
Write the correct chemical formula using proper notation:
- Water: H2O
- Carbon dioxide: CO2
- Glucose: C6H12O6
- Sodium chloride: NaCl
Step 2: Enter the Formula
Type the chemical formula exactly in the input field. Use capital letters for element symbols and numbers for subscripts.
Step 3: Click Calculate
Hit the “Calculate Molar Mass” button. The tool instantly processes your formula and displays the molar mass.
Step 4: Understand Your Results
The result shows molar mass in g/mol. This tells you how many grams one mole of the compound weighs.
Common Examples and Practice Problems
Practicle example:
Water (H2O)
- Hydrogen: 2 × 1.008 = 2.016 g/mol
- Oxygen: 1 × 15.999 = 15.999 g/mol
- Total: 18.015 g/mol
Carbon Dioxide (CO2)
- Carbon: 1 × 12.011 = 12.011 g/mol
- Oxygen: 2 × 15.999 = 31.998 g/mol
- Total: 44.009 g/mol
Frequently Asked Questions
What’s the difference between molecular weight and molar mass?
Molecular weight is unitless (in amu), while molar mass has units (g/mol). Numerically, they’re the same.
Can I calculate molar mass for mixtures?
No, this calculator works for pure compounds. Mixtures need weighted averages based on composition.
Can I use this for polymers?
Yes, but enter the repeating unit formula. Actual polymer molar masses vary widely.